EP0025341B1 - Steam throttle valve - Google Patents
Steam throttle valve Download PDFInfo
- Publication number
- EP0025341B1 EP0025341B1 EP80303081A EP80303081A EP0025341B1 EP 0025341 B1 EP0025341 B1 EP 0025341B1 EP 80303081 A EP80303081 A EP 80303081A EP 80303081 A EP80303081 A EP 80303081A EP 0025341 B1 EP0025341 B1 EP 0025341B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- valve
- throttle valve
- walled
- steam
- steam throttle
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22G—SUPERHEATING OF STEAM
- F22G5/00—Controlling superheat temperature
- F22G5/12—Controlling superheat temperature by attemperating the superheated steam, e.g. by injected water sprays
- F22G5/123—Water injection apparatus
- F22G5/126—Water injection apparatus in combination with steam-pressure reducing valves
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S261/00—Gas and liquid contact apparatus
- Y10S261/13—Desuperheaters
Definitions
- the invention relates to a steam throttle valve having water injection ducts which are disposed around the valve axis and downstream of the throttle cross-section.
- CH-A-586 366 discloses a steam throttle valve in which water is directed through a central bore in the valve spindle. A closure body is fixed to the end of this spindle. This document shows water mixing with the steam downstream of the throttle valve. The drawings show no injection canals downstream of the throttle cross section.
- the present invention provides a steam throttle valve having water injection orifices which are disposed around the valve axis downstream of the throttle aperture in which the water injection orifices are formed in a thin-walled manifold arrangement extending around the valve axis, the manifold having a thin-walled water supply pipe which is engaged in a bore of the valve casing.
- the use of the thin-walled hollow member virtually obviates thermal stress cracking in the water injection ducts.
- Another advantage provided by the invention is that erosion damage near the water injection orifices can be remedied readily by replacement of the hollow member without any need to replace expensive parts such as the valve casing or valve cover.
- the manifold arrangement comprises a single hollow thin-walled annular member extending all round the valve axis.
- the manifold arrangement comprises a plurality of hollow thin-walled members in the form of sectors of an annulus together extending all round the axis of the valve and each having such a thin-walled water supply pipe.
- the manifold arrangement is retained between two assembled-together parts of the valve structure.
- said two parts form a valve casing cover and a valve cage and the or each water supply pipe is disposed in the cover.
- cover and valve cage are interconnected by bolts or studs adjacent to the manifold arrangement.
- the water injection orifices are directed outwardly, preferably each at the same angle, from the valve axis.
- the water injection orifices are directed along helixes of equal pitch.
- a steam throttle valve 1 as shown in the drawing has a valve casing 2 having a steam inlet port 3, a steam discharge port 4, a valve aperture 18 between the ports 3 and 4 and a removable cover 6.
- the cover 6 is held on and secured to the valve casing 2 by screws 10 which are distributed around the periphery of the cover (only one of the screws 10 being shown) and which also secure a bottom flange 11 of bracket 12 for monitoring a servo motor (not shown) which may operate the valve.
- the cover 6 has a central sleeve extension 13 in which a valve spindle 15 is disposed for movement.
- Spindle 15 carries a throttle member 16 co-operating with the valve aperture 18 in casing 2, the aperture 18 being protected by a hard metal layer 17.
- a stuffing box 20 Disposed near the top end of cover 6 is a stuffing box 20 which seals the gap between the spindle 15 and its bore.
- a flange-like top end 40 of a substantially cylindrical valve cage 30 is secured to a shoulder 27 of cover 6 by a number of screws 32, only one of which is shown.
- the bottom end 34 of the valve cage is guided laterally in a recess 36 turned in casing 2.
- Distributed over the central region of the valve cage 30 are a number of bores 38 for the steam which flows through the valve in the direction indicated by arrows 14.
- annular thin-walled manifold 5 Disposed near the shoulder 27 and the flange 40 and between the cover and the cage, is an annular thin-walled manifold 5 which is arranged around spindle 15 and therefore around the valve axis.
- the manifold 5 has distributed around its periphery a number of water injection orifices 8 which are directed into the chamber formed between the sleeve 13 and valve cage 30, for example generally parallel to the valve axis.
- the manifold 5 also has a thin-walled water supply pipe 7 which is positioned in a correspondingly disposed bore in cover 6, the bore being parallel to the valve axis.
- the bore for the pipe 7 merges at its top end into a bore which is at right-angles to it and which extends out of cover 6 and in which a thin-walled pipe 9 which is shaped to contact the end of pipe 7 is positioned.
- the right-hand end of pipe 9 in the drawing merges into a flange 9' against which the head 56 of a feed water line 58 is retained and sealed by means of a crosshead 60 and screws (not shown).
- the manifold 5 is retained between cover 6 and cage 30 by those surfaces of cover 6 and cage 30 which engage with the manifold 5 being shaped toroidally.
- the injected water is supplied to the manifold 5 through a valve (not shown) line 58 and the water supply pipes 9, 7. More particularly during transient states, the water in the manifold 5 is at a considerably lower temperature than the steam in the valve cage chamber, but since the member is of thin-walled construction the temperature differences do not cause damage.
- the water injection orifices instead of being directed parallel to the valve axis, can be directed outwardly there from, for example, at an angle of 25°.
- the orifices 8 can be directed on helixes of equal pitch about the axis of the valve.
- two or more thin-walled manifolds can be provided each in the form of a sector of an annulus extending part of the way round the axis and co-operating with one another to extend all around the valve axis.
- Each such manifold would have its own water supply pipes arranged in a similar manner to the pipes 7 and 9 in bores in the casing or cover.
- a nozzle-like orifice can be inserted into manifold 5 at each orifice 8, to provide extended guidance of the issuing stream of water.
Description
- The invention relates to a steam throttle valve having water injection ducts which are disposed around the valve axis and downstream of the throttle cross-section.
- To ensure that a valve of this kind provides a uniform distribution of the injected water in the stream, it is known to provide a number of water injection ducts in relatively thick-walled casing parts, the ducts being disposed around the axis of the valve. See U.S.-A-3 243 157 especially Figure 3. If water is supplied abruptly through the water injection ducts when steam is flowing through the valve, there is a very abrupt local temperature drop in the casing or cover part which has the water injection ducts, with the risk of high thermal stresses arising near such ducts. Such thermal stresses can cause cracking, more particularly near the duct orifices, and the cracks may extend from one duct to another. Cracking is very frequent in cases in which the injected water is cooled as a result of passing through long lines before entering the valve.
- It is an object of the invention to provide a simple construction of such a valve obviating thermal stress cracking of this kind.
- CH-A-586 366 discloses a steam throttle valve in which water is directed through a central bore in the valve spindle. A closure body is fixed to the end of this spindle. This document shows water mixing with the steam downstream of the throttle valve. The drawings show no injection canals downstream of the throttle cross section.
- The present invention provides a steam throttle valve having water injection orifices which are disposed around the valve axis downstream of the throttle aperture in which the water injection orifices are formed in a thin-walled manifold arrangement extending around the valve axis, the manifold having a thin-walled water supply pipe which is engaged in a bore of the valve casing.
- The use of the thin-walled hollow member virtually obviates thermal stress cracking in the water injection ducts. Another advantage provided by the invention is that erosion damage near the water injection orifices can be remedied readily by replacement of the hollow member without any need to replace expensive parts such as the valve casing or valve cover.
- Preferably the manifold arrangement comprises a single hollow thin-walled annular member extending all round the valve axis.
- Preferably the manifold arrangement comprises a plurality of hollow thin-walled members in the form of sectors of an annulus together extending all round the axis of the valve and each having such a thin-walled water supply pipe.
- Preferably the manifold arrangement is retained between two assembled-together parts of the valve structure.
- Preferably said two parts form a valve casing cover and a valve cage and the or each water supply pipe is disposed in the cover.
- Preferably the cover and valve cage are interconnected by bolts or studs adjacent to the manifold arrangement.
- Preferably the water injection orifices are directed outwardly, preferably each at the same angle, from the valve axis.
- Preferably the water injection orifices are directed along helixes of equal pitch.
- In order to promote a fuller understanding of the above and other aspects of the present invention, an embodiment of the invention will be described by way of example only with reference to the accompanying drawing which is an axial cross-section through a steam throttle valve embodying the invention.
- A
steam throttle valve 1 as shown in the drawing has avalve casing 2 having a steam inlet port 3, asteam discharge port 4, avalve aperture 18 between theports 3 and 4 and aremovable cover 6. Thecover 6 is held on and secured to thevalve casing 2 byscrews 10 which are distributed around the periphery of the cover (only one of thescrews 10 being shown) and which also secure abottom flange 11 of bracket 12 for monitoring a servo motor (not shown) which may operate the valve. Thecover 6 has acentral sleeve extension 13 in which a valve spindle 15 is disposed for movement. Spindle 15 carries athrottle member 16 co-operating with thevalve aperture 18 incasing 2, theaperture 18 being protected by ahard metal layer 17. Disposed near the top end ofcover 6 is astuffing box 20 which seals the gap between the spindle 15 and its bore. - A flange-like
top end 40 of a substantiallycylindrical valve cage 30 is secured to ashoulder 27 ofcover 6 by a number ofscrews 32, only one of which is shown. Thebottom end 34 of the valve cage is guided laterally in arecess 36 turned incasing 2. Distributed over the central region of thevalve cage 30 are a number ofbores 38 for the steam which flows through the valve in the direction indicated byarrows 14. - Disposed near the
shoulder 27 and theflange 40 and between the cover and the cage, is an annular thin-walled manifold 5 which is arranged around spindle 15 and therefore around the valve axis. Themanifold 5 has distributed around its periphery a number of water injection orifices 8 which are directed into the chamber formed between thesleeve 13 andvalve cage 30, for example generally parallel to the valve axis. Themanifold 5 also has a thin-walled water supply pipe 7 which is positioned in a correspondingly disposed bore incover 6, the bore being parallel to the valve axis. The bore for the pipe 7 merges at its top end into a bore which is at right-angles to it and which extends out ofcover 6 and in which a thin-walled pipe 9 which is shaped to contact the end of pipe 7 is positioned. The right-hand end ofpipe 9 in the drawing merges into a flange 9' against which thehead 56 of afeed water line 58 is retained and sealed by means of acrosshead 60 and screws (not shown). Themanifold 5 is retained betweencover 6 andcage 30 by those surfaces ofcover 6 andcage 30 which engage with themanifold 5 being shaped toroidally. - In operation steam flows through the raised
throttle member 16 into the chamber which is inside thecage 30 and in which there is strong turbulence. Water is injected from themanifold 5 through the orifices 8 into the steam, most of the water evaporating in the steam while a minor proportion of the water is carried along by the steam in the form of droplets through thebores 38 and possible through thedischarge port 4. - The injected water is supplied to the
manifold 5 through a valve (not shown)line 58 and thewater supply pipes 9, 7. More particularly during transient states, the water in themanifold 5 is at a considerably lower temperature than the steam in the valve cage chamber, but since the member is of thin-walled construction the temperature differences do not cause damage. - Conveniently, to direct the streams of injected water away from the
extension 13 towards thevalve cage 30, the water injection orifices, instead of being directed parallel to the valve axis, can be directed outwardly there from, for example, at an angle of 25°. For the same purpose the orifices 8 can be directed on helixes of equal pitch about the axis of the valve. - Instead of just a
single manifold 5 extending all around the valve axis, two or more thin-walled manifolds can be provided each in the form of a sector of an annulus extending part of the way round the axis and co-operating with one another to extend all around the valve axis. Each such manifold would have its own water supply pipes arranged in a similar manner to thepipes 7 and 9 in bores in the casing or cover. - A nozzle-like orifice can be inserted into
manifold 5 at each orifice 8, to provide extended guidance of the issuing stream of water.
Claims (8)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH801279A CH641540A5 (en) | 1979-09-05 | 1979-09-05 | STEAM THROTTLE VALVE. |
CH8012/79 | 1979-09-05 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0025341A1 EP0025341A1 (en) | 1981-03-18 |
EP0025341B1 true EP0025341B1 (en) | 1984-01-25 |
Family
ID=4333792
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP80303081A Expired EP0025341B1 (en) | 1979-09-05 | 1980-09-03 | Steam throttle valve |
Country Status (10)
Country | Link |
---|---|
US (1) | US4278619A (en) |
EP (1) | EP0025341B1 (en) |
JP (2) | JPS5639367A (en) |
AU (1) | AU540815B2 (en) |
CA (1) | CA1133878A (en) |
CH (1) | CH641540A5 (en) |
DE (1) | DE3066290D1 (en) |
ES (1) | ES493937A0 (en) |
IN (1) | IN153604B (en) |
PL (1) | PL129067B1 (en) |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4442047A (en) * | 1982-10-08 | 1984-04-10 | White Consolidated Industries, Inc. | Multi-nozzle spray desuperheater |
US5338496A (en) * | 1993-04-22 | 1994-08-16 | Atwood & Morrill Co., Inc. | Plate type pressure-reducting desuperheater |
EP0953731A1 (en) * | 1998-04-30 | 1999-11-03 | Asea Brown Boveri AG | Steam introduction device in power plants |
US6305836B1 (en) * | 1999-07-09 | 2001-10-23 | Apv North America, Inc. | Force absorbing homogenization valve |
SE517823C2 (en) * | 2000-11-29 | 2002-07-16 | Tetra Laval Holdings & Finance | Adjustable steam injector |
JP3817132B2 (en) | 2000-11-30 | 2006-08-30 | ニイガタ・メーソンネーラン株式会社 | Steam conversion valve |
JP3718631B2 (en) * | 2000-11-30 | 2005-11-24 | ニイガタ・メーソンネーラン株式会社 | Steam conversion valve |
JP2002168407A (en) | 2000-11-30 | 2002-06-14 | Niigata Masoneilan Co Ltd | Steam desuperheating device |
ES2574011T3 (en) * | 2006-10-30 | 2016-06-14 | Valvitalia S.P.A. | De-heating device for steam lines |
US8469341B2 (en) * | 2010-06-03 | 2013-06-25 | Spx Corporation | Desuperheater seat-ring apparatus |
CN111256368B (en) * | 2018-11-30 | 2021-10-22 | 宁波方太厨具有限公司 | Built-in bubble water generating device and gas water heater using same |
CN113586006A (en) * | 2020-04-30 | 2021-11-02 | 中国石油天然气集团有限公司 | Valve core assembly for throttle valve and throttle valve |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3243157A (en) * | 1961-06-14 | 1966-03-29 | Zimmer Verfahrenstechnik | Reducing valves |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1526041A (en) * | 1923-03-21 | 1925-02-10 | Ingersoll Rand Co | Low-level multijet condenser |
US3219325A (en) * | 1962-12-04 | 1965-11-23 | Brown William | Mixing valve |
US3287001A (en) * | 1962-12-06 | 1966-11-22 | Schutte & Koerting Co | Steam desuperheater |
US3220708A (en) * | 1963-03-29 | 1965-11-30 | Maenaka Valve Works Co Ltd | Desuperheating and pressure-reducing valve for superheated steam |
US3331590A (en) * | 1965-02-18 | 1967-07-18 | Battenfeld Werner | Pressure reducing control valve |
DE1526977B2 (en) * | 1967-03-13 | 1975-05-07 | Kraftwerk Union Ag, 4330 Muelheim | Steam conversion valve for hot steam cooling |
US3719524A (en) * | 1970-05-13 | 1973-03-06 | Gen Electric | Variable flow steam circulator |
US3732851A (en) * | 1971-05-26 | 1973-05-15 | R Self | Method of and device for conditioning steam |
US3981946A (en) * | 1974-02-12 | 1976-09-21 | Tokico Ltd. | Perforated plate of steam reforming valve |
DE2435561C3 (en) * | 1974-07-24 | 1981-09-17 | Spenger-Zikesch, geb. Zikesch, Ursula, 8200 Rosenheim | Control valve |
US4011287A (en) * | 1975-07-11 | 1977-03-08 | David John Marley | Steam conditioning valve |
US3964516A (en) * | 1975-09-09 | 1976-06-22 | Dresser Industries, Inc. | Flow control valve for decoking |
US4071586A (en) * | 1976-10-26 | 1978-01-31 | Copes-Vulcan, Inc. | Variable orifice desuperheater |
-
1979
- 1979-09-05 CH CH801279A patent/CH641540A5/en not_active IP Right Cessation
-
1980
- 1980-08-01 ES ES493937A patent/ES493937A0/en active Granted
- 1980-08-21 US US06/179,963 patent/US4278619A/en not_active Expired - Lifetime
- 1980-08-28 IN IN986/CAL/80A patent/IN153604B/en unknown
- 1980-08-28 PL PL1980226462A patent/PL129067B1/en unknown
- 1980-09-03 EP EP80303081A patent/EP0025341B1/en not_active Expired
- 1980-09-03 DE DE8080303081T patent/DE3066290D1/en not_active Expired
- 1980-09-04 JP JP12183180A patent/JPS5639367A/en active Pending
- 1980-09-04 CA CA359,529A patent/CA1133878A/en not_active Expired
- 1980-09-04 AU AU62044/80A patent/AU540815B2/en not_active Expired
-
1984
- 1984-02-28 JP JP1984028217U patent/JPS59164878U/en active Granted
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3243157A (en) * | 1961-06-14 | 1966-03-29 | Zimmer Verfahrenstechnik | Reducing valves |
Also Published As
Publication number | Publication date |
---|---|
EP0025341A1 (en) | 1981-03-18 |
AU6204480A (en) | 1981-03-12 |
ES8103331A1 (en) | 1981-02-16 |
US4278619A (en) | 1981-07-14 |
CH641540A5 (en) | 1984-02-29 |
IN153604B (en) | 1984-07-28 |
AU540815B2 (en) | 1984-12-06 |
ES493937A0 (en) | 1981-02-16 |
DE3066290D1 (en) | 1984-03-01 |
PL129067B1 (en) | 1984-03-31 |
CA1133878A (en) | 1982-10-19 |
JPS6244221Y2 (en) | 1987-11-19 |
PL226462A1 (en) | 1981-05-22 |
JPS5639367A (en) | 1981-04-15 |
JPS59164878U (en) | 1984-11-05 |
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